"We see an entire planet which has many limitations"

"No man can climb out beyond the limitations of his own character"

"Wonder if there is life on another planet? Let's suppose there is. Suppose further, that only one star in a trillion has a planet that could support life. If that were the case, then there would be at least 100 million planets that harbored life"

"It suddenly struck me that that tiny pea, pretty and blue, was the Earth. I put up my thumb and shut one eye, and my thumb blotted out the planet Earth. I didn't feel like a giant. I felt very, very small"

"Here men from the planet Earth first set foot upon the Moon. July 1969 AD. We came in peace for all mankind"

"You are the architect of your own destiny; you are the master of your own fate; you are behind the steering wheel of your own life. There are no limitations to what you can do, have, or be except the limitations you place on yourself by your own thinking"

"How inappropriate to call this planet Earth when it is quite clearly Ocean"

"I think I got off on the wrong planet. Beam me up Scotty, there's no rational life here"

"Now, we put out a lot of carbon dioxide every year, over 26 billion tons. For each American, it's about 20 tons. For people in poor countries, it's less than one ton. It's an average of about five tons for everyone on the planet. And, somehow, we have to make changes that will bring that down to zero"

"Argue for your limitations, and sure enough they're yours"

"Two hundred or more years ago most people on the planet were never aware of any reality other than the one into which they were brought up"